If this is your first visit, be sure to
check out the FAQ by clicking the
link above. You may have to register
before you can post: click the register link above to proceed. To start viewing messages,
select the forum that you want to visit from the selection below.

The more effort you put into posting up your questions, the more effort users will put into replying. There is no such thing as a dumb question, but please don't be lazy...

Why such high compression? There's no need unless running big cams to utilize the comp. Stock ecu should run a fairly stock 7age not one with some work but.

Cams later.

Originally Posted by n2866

With the 7age you really wanna beef up the bottom end because of the extra stroke they dont wanna rev out as far as the 4age. For an alright budget spool rods are good for 500 bucks can't complain and they shod hold up easy at say like 8100rpm all day. Can't remember how much mat paid for the pistons but it was Probs about 700 you can go cheap pistons but like I said you'd want to build up the bottom end strong. And again with the choice of cr depends on the ecu you want and what the is used for like track or daily.

If staying stock ecu you wouldnt want to put too big cams because your also asking the ecu to compensate for the extra 200cc your putting through the motor.

Depends on budget.
Motec would be smick. But something like a haltec would be good.

Want stock ecu. And like 27x cams

Oversize Toyota pistons fine?

Originally Posted by pen15

i run an adaptronic e420c but if you want to build a 7a do a robo and build it pretty much stock with better rods of course

pm me marvis i may have something good for you soon

the issue you will have with cams is that its not the stock rev range that is affected but the limiter on a stock management the ecu will throw as much fuel as it can into the motor on the limiter fouling the plugs this is what happened to me when i ran stock ecu with my current cams a long time ago driving was fine but when it hit the limiter the plugs got fouled instantly

you are incorrect about the spool rods not being able to handle the rpm as they can, what would give up first its the crank and vibration combined with a ross harmonic balancer you can easily see 9000rpm with spool rods the vibration in the 7a is what makes the engine weak the rods are fine for strength they are balanced very well even better than stock blacktop rods from factory
the spool rods are also shot peened making them less likely to cracking the only thing that would let go is the rod bolts and arp2000 are quiet strong if i want to rev mine more ill get stronger rod bolts we all now a blacktop can rev to 9000 stock and if you want a comparison from blacktop rods to spool 7a there is no comparison the spool rods are far stronger and better balanced i know i have balanced blacktop rods and weighed up spool (spool didnt need balancing)

in the end it comes down to engine balanced you crank, pistons and rods all need to be perfect if not then you wont be able to rev it out

Worth balancing crank and running lighter harmonic balancer? Like about would like to go 27x cams later. stock ecu..

Originally Posted by trikzlane

I love streeting, Lowdown cars and watching the world unwind by every word Marv types.

only if the limiter gets sat on alot as in drifting but as for racing i think it would be fine and as for the compression i think the more comp the better allows for upgrading the head later and the more comp you have the more efficient the engine will run there is power to be made just in upping the comp lok at smallport compared to bigport 86kw at fly to 100kw at fly cams are the same duration only major difference is the comp, intake ports and ecu

the dyno pull to 300rwkw

BT20v is making 300rwkw like i said i would without nitrous so now its time for some spray and see if she will run a 10s or less

that's my setup there is nothing to over the top for the moment but my new head will flow a few more horses with all the wright mods a 7a will make power up high im thinking of also building a 7a 1zz crank for a nice 2L setup

the dyno pull to 300rwkw

BT20v is making 300rwkw like i said i would without nitrous so now its time for some spray and see if she will run a 10s or less